Fix crash XBoard on changing Game List Tags

When the Game List was not up, the attempt to immediately update its
contents after changing the game-header format through the Game List Tags
dialog would result in a segfault.

diff --git a/ngamelist.c b/ngamelist.c
index d202ad6..53df236 100644 (file)
--- a/ngamelist.c
+++ b/ngamelist.c
@@ -223,6 +223,7 @@ GameListReplace (int page)
 void
 GameListUpdate ()
 {
+    if(!DialogExists(GameListDlg)) return;
     GameListPrepare(False, False);
     GameListReplace(0);
 }